Bitcoin Core  27.99.0
P2P Digital Currency
denialofservice_tests.cpp
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1 // Copyright (c) 2011-2022 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
5 // Unit tests for denial-of-service detection/prevention code
6 
7 #include <banman.h>
8 #include <chainparams.h>
9 #include <common/args.h>
10 #include <net.h>
11 #include <net_processing.h>
12 #include <pubkey.h>
13 #include <script/sign.h>
14 #include <script/signingprovider.h>
15 #include <serialize.h>
16 #include <test/util/net.h>
17 #include <test/util/random.h>
18 #include <test/util/setup_common.h>
19 #include <util/string.h>
20 #include <util/time.h>
21 #include <validation.h>
22 
23 #include <array>
24 #include <stdint.h>
25 
26 #include <boost/test/unit_test.hpp>
27 
28 static CService ip(uint32_t i)
29 {
30  struct in_addr s;
31  s.s_addr = i;
32  return CService(CNetAddr(s), Params().GetDefaultPort());
33 }
34 
35 BOOST_FIXTURE_TEST_SUITE(denialofservice_tests, TestingSetup)
36 
37 // Test eviction of an outbound peer whose chain never advances
38 // Mock a node connection, and use mocktime to simulate a peer
39 // which never sends any headers messages. PeerLogic should
40 // decide to evict that outbound peer, after the appropriate timeouts.
41 // Note that we protect 4 outbound nodes from being subject to
42 // this logic; this test takes advantage of that protection only
43 // being applied to nodes which send headers with sufficient
44 // work.
45 BOOST_AUTO_TEST_CASE(outbound_slow_chain_eviction)
46 {
48 
49  ConnmanTestMsg& connman = static_cast<ConnmanTestMsg&>(*m_node.connman);
50  // Disable inactivity checks for this test to avoid interference
51  connman.SetPeerConnectTimeout(99999s);
52  PeerManager& peerman = *m_node.peerman;
53 
54  // Mock an outbound peer
55  CAddress addr1(ip(0xa0b0c001), NODE_NONE);
56  NodeId id{0};
57  CNode dummyNode1{id++,
58  /*sock=*/nullptr,
59  addr1,
60  /*nKeyedNetGroupIn=*/0,
61  /*nLocalHostNonceIn=*/0,
62  CAddress(),
63  /*addrNameIn=*/"",
65  /*inbound_onion=*/false};
66 
67  connman.Handshake(
68  /*node=*/dummyNode1,
69  /*successfully_connected=*/true,
70  /*remote_services=*/ServiceFlags(NODE_NETWORK | NODE_WITNESS),
71  /*local_services=*/ServiceFlags(NODE_NETWORK | NODE_WITNESS),
72  /*version=*/PROTOCOL_VERSION,
73  /*relay_txs=*/true);
74 
75  // This test requires that we have a chain with non-zero work.
76  {
77  LOCK(cs_main);
78  BOOST_CHECK(m_node.chainman->ActiveChain().Tip() != nullptr);
79  BOOST_CHECK(m_node.chainman->ActiveChain().Tip()->nChainWork > 0);
80  }
81 
82  // Test starts here
83  BOOST_CHECK(peerman.SendMessages(&dummyNode1)); // should result in getheaders
84 
85  {
86  LOCK(dummyNode1.cs_vSend);
87  const auto& [to_send, _more, _msg_type] = dummyNode1.m_transport->GetBytesToSend(false);
88  BOOST_CHECK(!to_send.empty());
89  }
90  connman.FlushSendBuffer(dummyNode1);
91 
92  int64_t nStartTime = GetTime();
93  // Wait 21 minutes
94  SetMockTime(nStartTime+21*60);
95  BOOST_CHECK(peerman.SendMessages(&dummyNode1)); // should result in getheaders
96  {
97  LOCK(dummyNode1.cs_vSend);
98  const auto& [to_send, _more, _msg_type] = dummyNode1.m_transport->GetBytesToSend(false);
99  BOOST_CHECK(!to_send.empty());
100  }
101  // Wait 3 more minutes
102  SetMockTime(nStartTime+24*60);
103  BOOST_CHECK(peerman.SendMessages(&dummyNode1)); // should result in disconnect
104  BOOST_CHECK(dummyNode1.fDisconnect == true);
105 
106  peerman.FinalizeNode(dummyNode1);
107 }
108 
109 static void AddRandomOutboundPeer(NodeId& id, std::vector<CNode*>& vNodes, PeerManager& peerLogic, ConnmanTestMsg& connman, ConnectionType connType, bool onion_peer = false)
110 {
111  CAddress addr;
112 
113  if (onion_peer) {
115  BOOST_REQUIRE(addr.SetSpecial(OnionToString(tor_addr)));
116  }
117 
118  while (!addr.IsRoutable()) {
120  }
121 
122  vNodes.emplace_back(new CNode{id++,
123  /*sock=*/nullptr,
124  addr,
125  /*nKeyedNetGroupIn=*/0,
126  /*nLocalHostNonceIn=*/0,
127  CAddress(),
128  /*addrNameIn=*/"",
129  connType,
130  /*inbound_onion=*/false});
131  CNode &node = *vNodes.back();
132  node.SetCommonVersion(PROTOCOL_VERSION);
133 
135  node.fSuccessfullyConnected = true;
136 
137  connman.AddTestNode(node);
138 }
139 
140 BOOST_AUTO_TEST_CASE(stale_tip_peer_management)
141 {
142  NodeId id{0};
143  auto connman = std::make_unique<ConnmanTestMsg>(0x1337, 0x1337, *m_node.addrman, *m_node.netgroupman, Params());
144  auto peerLogic = PeerManager::make(*connman, *m_node.addrman, nullptr, *m_node.chainman, *m_node.mempool, {});
145 
146  constexpr int max_outbound_full_relay = MAX_OUTBOUND_FULL_RELAY_CONNECTIONS;
147  CConnman::Options options;
149 
150  const auto time_init{GetTime<std::chrono::seconds>()};
151  SetMockTime(time_init);
152  const auto time_later{time_init + 3 * std::chrono::seconds{m_node.chainman->GetConsensus().nPowTargetSpacing} + 1s};
153  connman->Init(options);
154  std::vector<CNode *> vNodes;
155 
156  // Mock some outbound peers
157  for (int i = 0; i < max_outbound_full_relay; ++i) {
158  AddRandomOutboundPeer(id, vNodes, *peerLogic, *connman, ConnectionType::OUTBOUND_FULL_RELAY);
159  }
160 
161  peerLogic->CheckForStaleTipAndEvictPeers();
162 
163  // No nodes should be marked for disconnection while we have no extra peers
164  for (const CNode *node : vNodes) {
165  BOOST_CHECK(node->fDisconnect == false);
166  }
167 
168  SetMockTime(time_later);
169 
170  // Now tip should definitely be stale, and we should look for an extra
171  // outbound peer
172  peerLogic->CheckForStaleTipAndEvictPeers();
173  BOOST_CHECK(connman->GetTryNewOutboundPeer());
174 
175  // Still no peers should be marked for disconnection
176  for (const CNode *node : vNodes) {
177  BOOST_CHECK(node->fDisconnect == false);
178  }
179 
180  // If we add one more peer, something should get marked for eviction
181  // on the next check (since we're mocking the time to be in the future, the
182  // required time connected check should be satisfied).
183  SetMockTime(time_init);
184  AddRandomOutboundPeer(id, vNodes, *peerLogic, *connman, ConnectionType::OUTBOUND_FULL_RELAY);
185  SetMockTime(time_later);
186 
187  peerLogic->CheckForStaleTipAndEvictPeers();
188  for (int i = 0; i < max_outbound_full_relay; ++i) {
189  BOOST_CHECK(vNodes[i]->fDisconnect == false);
190  }
191  // Last added node should get marked for eviction
192  BOOST_CHECK(vNodes.back()->fDisconnect == true);
193 
194  vNodes.back()->fDisconnect = false;
195 
196  // Update the last announced block time for the last
197  // peer, and check that the next newest node gets evicted.
198  peerLogic->UpdateLastBlockAnnounceTime(vNodes.back()->GetId(), GetTime());
199 
200  peerLogic->CheckForStaleTipAndEvictPeers();
201  for (int i = 0; i < max_outbound_full_relay - 1; ++i) {
202  BOOST_CHECK(vNodes[i]->fDisconnect == false);
203  }
204  BOOST_CHECK(vNodes[max_outbound_full_relay-1]->fDisconnect == true);
205  BOOST_CHECK(vNodes.back()->fDisconnect == false);
206 
207  vNodes[max_outbound_full_relay - 1]->fDisconnect = false;
208 
209  // Add an onion peer, that will be protected because it is the only one for
210  // its network, so another peer gets disconnected instead.
211  SetMockTime(time_init);
212  AddRandomOutboundPeer(id, vNodes, *peerLogic, *connman, ConnectionType::OUTBOUND_FULL_RELAY, /*onion_peer=*/true);
213  SetMockTime(time_later);
214  peerLogic->CheckForStaleTipAndEvictPeers();
215 
216  for (int i = 0; i < max_outbound_full_relay - 2; ++i) {
217  BOOST_CHECK(vNodes[i]->fDisconnect == false);
218  }
219  BOOST_CHECK(vNodes[max_outbound_full_relay - 2]->fDisconnect == false);
220  BOOST_CHECK(vNodes[max_outbound_full_relay - 1]->fDisconnect == true);
221  BOOST_CHECK(vNodes[max_outbound_full_relay]->fDisconnect == false);
222 
223  // Add a second onion peer which won't be protected
224  SetMockTime(time_init);
225  AddRandomOutboundPeer(id, vNodes, *peerLogic, *connman, ConnectionType::OUTBOUND_FULL_RELAY, /*onion_peer=*/true);
226  SetMockTime(time_later);
227  peerLogic->CheckForStaleTipAndEvictPeers();
228 
229  BOOST_CHECK(vNodes.back()->fDisconnect == true);
230 
231  for (const CNode *node : vNodes) {
232  peerLogic->FinalizeNode(*node);
233  }
234 
235  connman->ClearTestNodes();
236 }
237 
238 BOOST_AUTO_TEST_CASE(block_relay_only_eviction)
239 {
240  NodeId id{0};
241  auto connman = std::make_unique<ConnmanTestMsg>(0x1337, 0x1337, *m_node.addrman, *m_node.netgroupman, Params());
242  auto peerLogic = PeerManager::make(*connman, *m_node.addrman, nullptr, *m_node.chainman, *m_node.mempool, {});
243 
244  constexpr int max_outbound_block_relay{MAX_BLOCK_RELAY_ONLY_CONNECTIONS};
245  constexpr int64_t MINIMUM_CONNECT_TIME{30};
246  CConnman::Options options;
248 
249  connman->Init(options);
250  std::vector<CNode*> vNodes;
251 
252  // Add block-relay-only peers up to the limit
253  for (int i = 0; i < max_outbound_block_relay; ++i) {
254  AddRandomOutboundPeer(id, vNodes, *peerLogic, *connman, ConnectionType::BLOCK_RELAY);
255  }
256  peerLogic->CheckForStaleTipAndEvictPeers();
257 
258  for (int i = 0; i < max_outbound_block_relay; ++i) {
259  BOOST_CHECK(vNodes[i]->fDisconnect == false);
260  }
261 
262  // Add an extra block-relay-only peer breaking the limit (mocks logic in ThreadOpenConnections)
263  AddRandomOutboundPeer(id, vNodes, *peerLogic, *connman, ConnectionType::BLOCK_RELAY);
264  peerLogic->CheckForStaleTipAndEvictPeers();
265 
266  // The extra peer should only get marked for eviction after MINIMUM_CONNECT_TIME
267  for (int i = 0; i < max_outbound_block_relay; ++i) {
268  BOOST_CHECK(vNodes[i]->fDisconnect == false);
269  }
270  BOOST_CHECK(vNodes.back()->fDisconnect == false);
271 
273  peerLogic->CheckForStaleTipAndEvictPeers();
274  for (int i = 0; i < max_outbound_block_relay; ++i) {
275  BOOST_CHECK(vNodes[i]->fDisconnect == false);
276  }
277  BOOST_CHECK(vNodes.back()->fDisconnect == true);
278 
279  // Update the last block time for the extra peer,
280  // and check that the next youngest peer gets evicted.
281  vNodes.back()->fDisconnect = false;
282  vNodes.back()->m_last_block_time = GetTime<std::chrono::seconds>();
283 
284  peerLogic->CheckForStaleTipAndEvictPeers();
285  for (int i = 0; i < max_outbound_block_relay - 1; ++i) {
286  BOOST_CHECK(vNodes[i]->fDisconnect == false);
287  }
288  BOOST_CHECK(vNodes[max_outbound_block_relay - 1]->fDisconnect == true);
289  BOOST_CHECK(vNodes.back()->fDisconnect == false);
290 
291  for (const CNode* node : vNodes) {
292  peerLogic->FinalizeNode(*node);
293  }
294  connman->ClearTestNodes();
295 }
296 
297 BOOST_AUTO_TEST_CASE(peer_discouragement)
298 {
300 
301  auto banman = std::make_unique<BanMan>(m_args.GetDataDirBase() / "banlist", nullptr, DEFAULT_MISBEHAVING_BANTIME);
302  auto connman = std::make_unique<ConnmanTestMsg>(0x1337, 0x1337, *m_node.addrman, *m_node.netgroupman, Params());
303  auto peerLogic = PeerManager::make(*connman, *m_node.addrman, banman.get(), *m_node.chainman, *m_node.mempool, {});
304 
305  CNetAddr tor_netaddr;
306  BOOST_REQUIRE(
307  tor_netaddr.SetSpecial("pg6mmjiyjmcrsslvykfwnntlaru7p5svn6y2ymmju6nubxndf4pscryd.onion"));
308  const CService tor_service{tor_netaddr, Params().GetDefaultPort()};
309 
310  const std::array<CAddress, 3> addr{CAddress{ip(0xa0b0c001), NODE_NONE},
311  CAddress{ip(0xa0b0c002), NODE_NONE},
312  CAddress{tor_service, NODE_NONE}};
313 
314  const CNetAddr other_addr{ip(0xa0b0ff01)}; // Not any of addr[].
315 
316  std::array<CNode*, 3> nodes;
317 
318  banman->ClearBanned();
319  NodeId id{0};
320  nodes[0] = new CNode{id++,
321  /*sock=*/nullptr,
322  addr[0],
323  /*nKeyedNetGroupIn=*/0,
324  /*nLocalHostNonceIn=*/0,
325  CAddress(),
326  /*addrNameIn=*/"",
328  /*inbound_onion=*/false};
329  nodes[0]->SetCommonVersion(PROTOCOL_VERSION);
330  peerLogic->InitializeNode(*nodes[0], NODE_NETWORK);
331  nodes[0]->fSuccessfullyConnected = true;
332  connman->AddTestNode(*nodes[0]);
333  peerLogic->UnitTestMisbehaving(nodes[0]->GetId(), DISCOURAGEMENT_THRESHOLD); // Should be discouraged
334  BOOST_CHECK(peerLogic->SendMessages(nodes[0]));
335 
336  BOOST_CHECK(banman->IsDiscouraged(addr[0]));
337  BOOST_CHECK(nodes[0]->fDisconnect);
338  BOOST_CHECK(!banman->IsDiscouraged(other_addr)); // Different address, not discouraged
339 
340  nodes[1] = new CNode{id++,
341  /*sock=*/nullptr,
342  addr[1],
343  /*nKeyedNetGroupIn=*/1,
344  /*nLocalHostNonceIn=*/1,
345  CAddress(),
346  /*addrNameIn=*/"",
348  /*inbound_onion=*/false};
349  nodes[1]->SetCommonVersion(PROTOCOL_VERSION);
350  peerLogic->InitializeNode(*nodes[1], NODE_NETWORK);
351  nodes[1]->fSuccessfullyConnected = true;
352  connman->AddTestNode(*nodes[1]);
353  peerLogic->UnitTestMisbehaving(nodes[1]->GetId(), DISCOURAGEMENT_THRESHOLD - 1);
354  BOOST_CHECK(peerLogic->SendMessages(nodes[1]));
355  // [0] is still discouraged/disconnected.
356  BOOST_CHECK(banman->IsDiscouraged(addr[0]));
357  BOOST_CHECK(nodes[0]->fDisconnect);
358  // [1] is not discouraged/disconnected yet.
359  BOOST_CHECK(!banman->IsDiscouraged(addr[1]));
360  BOOST_CHECK(!nodes[1]->fDisconnect);
361  peerLogic->UnitTestMisbehaving(nodes[1]->GetId(), 1); // [1] reaches discouragement threshold
362  BOOST_CHECK(peerLogic->SendMessages(nodes[1]));
363  // Expect both [0] and [1] to be discouraged/disconnected now.
364  BOOST_CHECK(banman->IsDiscouraged(addr[0]));
365  BOOST_CHECK(nodes[0]->fDisconnect);
366  BOOST_CHECK(banman->IsDiscouraged(addr[1]));
367  BOOST_CHECK(nodes[1]->fDisconnect);
368 
369  // Make sure non-IP peers are discouraged and disconnected properly.
370 
371  nodes[2] = new CNode{id++,
372  /*sock=*/nullptr,
373  addr[2],
374  /*nKeyedNetGroupIn=*/1,
375  /*nLocalHostNonceIn=*/1,
376  CAddress(),
377  /*addrNameIn=*/"",
379  /*inbound_onion=*/false};
380  nodes[2]->SetCommonVersion(PROTOCOL_VERSION);
381  peerLogic->InitializeNode(*nodes[2], NODE_NETWORK);
382  nodes[2]->fSuccessfullyConnected = true;
383  connman->AddTestNode(*nodes[2]);
384  peerLogic->UnitTestMisbehaving(nodes[2]->GetId(), DISCOURAGEMENT_THRESHOLD);
385  BOOST_CHECK(peerLogic->SendMessages(nodes[2]));
386  BOOST_CHECK(banman->IsDiscouraged(addr[0]));
387  BOOST_CHECK(banman->IsDiscouraged(addr[1]));
388  BOOST_CHECK(banman->IsDiscouraged(addr[2]));
389  BOOST_CHECK(nodes[0]->fDisconnect);
390  BOOST_CHECK(nodes[1]->fDisconnect);
391  BOOST_CHECK(nodes[2]->fDisconnect);
392 
393  for (CNode* node : nodes) {
394  peerLogic->FinalizeNode(*node);
395  }
396  connman->ClearTestNodes();
397 }
398 
400 {
402 
403  auto banman = std::make_unique<BanMan>(m_args.GetDataDirBase() / "banlist", nullptr, DEFAULT_MISBEHAVING_BANTIME);
404  auto connman = std::make_unique<CConnman>(0x1337, 0x1337, *m_node.addrman, *m_node.netgroupman, Params());
405  auto peerLogic = PeerManager::make(*connman, *m_node.addrman, banman.get(), *m_node.chainman, *m_node.mempool, {});
406 
407  banman->ClearBanned();
408  int64_t nStartTime = GetTime();
409  SetMockTime(nStartTime); // Overrides future calls to GetTime()
410 
411  CAddress addr(ip(0xa0b0c001), NODE_NONE);
412  NodeId id{0};
413  CNode dummyNode{id++,
414  /*sock=*/nullptr,
415  addr,
416  /*nKeyedNetGroupIn=*/4,
417  /*nLocalHostNonceIn=*/4,
418  CAddress(),
419  /*addrNameIn=*/"",
421  /*inbound_onion=*/false};
422  dummyNode.SetCommonVersion(PROTOCOL_VERSION);
423  peerLogic->InitializeNode(dummyNode, NODE_NETWORK);
424  dummyNode.fSuccessfullyConnected = true;
425 
426  peerLogic->UnitTestMisbehaving(dummyNode.GetId(), DISCOURAGEMENT_THRESHOLD);
427  BOOST_CHECK(peerLogic->SendMessages(&dummyNode));
428  BOOST_CHECK(banman->IsDiscouraged(addr));
429 
430  peerLogic->FinalizeNode(dummyNode);
431 }
432 
static constexpr unsigned int DEFAULT_MISBEHAVING_BANTIME
Definition: banman.h:19
node::NodeContext m_node
Definition: bitcoin-gui.cpp:37
const CChainParams & Params()
Return the currently selected parameters.
A CService with information about it as peer.
Definition: protocol.h:367
uint16_t GetDefaultPort() const
Definition: chainparams.h:95
Network address.
Definition: netaddress.h:112
bool SetSpecial(const std::string &addr)
Parse a Tor or I2P address and set this object to it.
Definition: netaddress.cpp:208
bool IsRoutable() const
Definition: netaddress.cpp:463
Information about a peer.
Definition: net.h:670
A combination of a network address (CNetAddr) and a (TCP) port.
Definition: netaddress.h:531
uint64_t randbits(int bits) noexcept
Generate a random (bits)-bit integer.
Definition: random.h:185
std::vector< B > randbytes(size_t len)
Generate random bytes.
Definition: random.cpp:671
static Mutex g_msgproc_mutex
Mutex for anything that is only accessed via the msg processing thread.
Definition: net.h:992
virtual bool SendMessages(CNode *pnode) EXCLUSIVE_LOCKS_REQUIRED(g_msgproc_mutex)=0
Send queued protocol messages to a given node.
virtual void FinalizeNode(const CNode &node)=0
Handle removal of a peer (clear state)
virtual void InitializeNode(CNode &node, ServiceFlags our_services)=0
Initialize a peer (setup state, queue any initial messages)
static std::unique_ptr< PeerManager > make(CConnman &connman, AddrMan &addrman, BanMan *banman, ChainstateManager &chainman, CTxMemPool &pool, Options opts)
ConnectionType
Different types of connections to a peer.
@ BLOCK_RELAY
We use block-relay-only connections to help prevent against partition attacks.
@ OUTBOUND_FULL_RELAY
These are the default connections that we use to connect with the network.
@ INBOUND
Inbound connections are those initiated by a peer.
RecursiveMutex cs_main
Mutex to guard access to validation specific variables, such as reading or changing the chainstate.
Definition: cs_main.cpp:8
BOOST_AUTO_TEST_SUITE_END()
BOOST_AUTO_TEST_CASE(outbound_slow_chain_eviction)
static void AddRandomOutboundPeer(NodeId &id, std::vector< CNode * > &vNodes, PeerManager &peerLogic, ConnmanTestMsg &connman, ConnectionType connType, bool onion_peer=false)
static CService ip(uint32_t i)
static const std::string addr1
Definition: key_tests.cpp:26
Definition: init.h:25
static const unsigned int DEFAULT_MAX_PEER_CONNECTIONS
The maximum number of peer connections to maintain.
Definition: net.h:77
int64_t NodeId
Definition: net.h:97
static const int MAX_OUTBOUND_FULL_RELAY_CONNECTIONS
Maximum number of automatic outgoing nodes over which we'll relay everything (blocks,...
Definition: net.h:67
static const int MAX_BLOCK_RELAY_ONLY_CONNECTIONS
Maximum number of block-relay-only outgoing connections.
Definition: net.h:71
static constexpr auto MINIMUM_CONNECT_TIME
Minimum time an outbound-peer-eviction candidate must be connected for, in order to evict.
static const int DISCOURAGEMENT_THRESHOLD
Threshold for marking a node to be discouraged, e.g.
std::string OnionToString(Span< const uint8_t > addr)
Definition: netaddress.cpp:570
static constexpr size_t ADDR_TORV3_SIZE
Size of TORv3 address (in bytes).
Definition: netaddress.h:92
#define BOOST_CHECK(expr)
Definition: object.cpp:17
ServiceFlags
nServices flags
Definition: protocol.h:309
@ NODE_NONE
Definition: protocol.h:312
@ NODE_WITNESS
Definition: protocol.h:320
@ NODE_NETWORK
Definition: protocol.h:315
static const int PROTOCOL_VERSION
network protocol versioning
int m_max_automatic_connections
Definition: net.h:1039
void AddTestNode(CNode &node)
Definition: net.h:48
void FlushSendBuffer(CNode &node) const
Definition: net.cpp:78
void SetPeerConnectTimeout(std::chrono::seconds timeout)
Definition: net.h:37
Testing setup that configures a complete environment.
Definition: setup_common.h:85
std::unique_ptr< CConnman > connman
Definition: context.h:62
std::unique_ptr< CTxMemPool > mempool
Definition: context.h:63
std::unique_ptr< AddrMan > addrman
Definition: context.h:61
std::unique_ptr< ChainstateManager > chainman
Definition: context.h:67
std::unique_ptr< PeerManager > peerman
Definition: context.h:66
std::unique_ptr< const NetGroupManager > netgroupman
Definition: context.h:64
#define LOCK(cs)
Definition: sync.h:257
FastRandomContext g_insecure_rand_ctx
This global and the helpers that use it are not thread-safe.
Definition: random.cpp:14
int64_t GetTime()
Definition: time.cpp:44
void SetMockTime(int64_t nMockTimeIn)
DEPRECATED Use SetMockTime with chrono type.
Definition: time.cpp:32